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Fix a position in a webcam video

Hello everyone,

What I want to do is the following. I want to draw an arrow in a webcam video. While the webcam is moving the arrow should get drawn at the right position relativly to the video (in the correct real world coords). The important part is to fix the position of a point in a moving video. Does anyone have some ideas how to achieve that?

Fix a position in a webcam video

Hello everyone,

What I want to do is the following. I want to draw an arrow in a webcam video. While the webcam is moving the arrow should get drawn at the right position relativly to the video (in the correct real world coords). The important part is to fix the position of a point in a moving video. Does anyone have some ideas how to achieve that?